Envision Peripherals NV3128 User Manual download pdf (Page 79)

NV3128 RS-422A Machine Control Data Routing Switch 5-5

SIGNAL PATH

The quickest way to isolate problems in a single connection is by module

substitution. If sufficient spares are not available to carry out this strategy,

the next best recourse is path substitution:

1. Route the problem signal to a new crosspoint/output address.

2. If new route does not correct the problem, the source port circuitry is

probably faulty. Verify by reconnecting the source machine to a new port,

or by swapping the two I/O modules. The upper of the two I/O modules

supports ports 1-64. The lower module supports ports 65-128. Do not

overlook the possibility of a problem in the external cabling or equipment.

3. Assuming the new route of Step 1 passed signal, route any signal to the

problematic output with the I/O cards swapped. Signal passes? Then the

I/O module is defective. No Go? The crosspoint module is at fault.

MAPPING AND COMMAND PROBLEMS

Most switch problems result from the complexity of the control system

interface. Refer to section 3 (older systems) or the UniDiag manual (newer

systems) for a discussion of the PC-based diagnostic and control utilities

furnished with the routing switch.

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Envision Peripherals NV3128 User Manual Page 79